Blood Pressure and Diabetes Limits for the Seafarer Medical: What the Rules Actually Say (2026)

Ask any approved examiner in India which two findings send the most seafarers home without a certificate, and you will get the same answer: blood pressure and blood sugar. Not eyesight. Not hearing. Two numbers, taken in a few minutes, that decide whether a man sails on his joining date or spends the next three weeks trying to fix something he did not know he had.

What makes it worse is that almost nothing written about this online gives you the actual limits. You will find pages telling you to “keep your BP normal” and “control your sugar”, which is true and useless. This guide gives you the numbers that are written in the rules, where they come from, and what actually happens on the day.

Short answer: The Merchant Shipping (Medical Examination) Rules, 2000 set out blood pressure limits in Annexure B, Section 7. A reading above 150/90 mmHg disqualifies a new candidate; for a serving seafarer the limit is 160/100 mmHg under the age of 50 and 175/100 mmHg over 50. Treated hypertension is not automatically disqualifying, but it is recorded as needing close monitoring. Diabetes mellitus appears in Annexure A among conditions that generally render a person unfit, with the examining doctor assessing each case on control and records. These are the statutory standards — your shipping company and the flag State may apply stricter ones.

Why These Two Numbers Decide So Many Medicals

A ship is the worst place in the world to have a cardiovascular or metabolic emergency. There is no cardiology unit two streets away. A diversion to the nearest port can take days and costs a shipping company a great deal of money, and in the middle of an ocean it may not be an option at all.

That is the entire logic behind the limits. They are not there to keep people out of the industry. They are there because a stroke or a hypoglycaemic collapse at sea is a problem nobody on board can solve.

Both conditions also share an unpleasant feature: they are usually silent until they are measured. Most Indian seafarers who find out at a medical that their blood pressure is 160/105 had no symptoms at all. The examination is often the first time anybody has checked.

The Actual Blood Pressure Limits

These come from Annexure B, Section 7 (Cardiovascular System) of the Merchant Shipping (Medical Examination) Rules, 2000 — the statutory instrument Indian approved examiners work to.

Who you are	Blood pressure at or above which the standard is not met
New candidate (first medical, pre-sea, cadet, fresh entry)	150 / 90 mmHg
Serving seafarer, under 50 years	160 / 100 mmHg
Serving seafarer, over 50 years	175 / 100 mmHg
Treated hypertension	Not automatically disqualifying — recorded as requiring close monitoring

Three things in that table are worth sitting with, because they are the parts seafarers get wrong.

The new candidate standard is the strictest

If this is your first medical — pre-sea, cadet entry, a sponsorship medical, your first CDC — you are held to 150/90, which is tighter than for a serving officer. The logic is straightforward: the industry is cautious about taking on a career that will last decades with a cardiovascular problem already present at the start.

This catches a lot of young candidates by surprise, because 150/90 is not a dramatic number. A twenty-two-year-old who has travelled overnight, slept badly, had two cups of tea and is nervous about his career can produce it without having hypertension at all.

The standard loosens with age and sea service, not with argument

A serving seafarer under 50 is assessed at 160/100, and over 50 at 175/100. That is a recognition that blood pressure rises with age and that an experienced seafarer with a track record is a different proposition from an untested entrant. It is not a negotiation. The examiner applies the standard that fits your category.

Being on medication is not, by itself, a disqualification

This is the single most useful thing in this article, and the thing most often misunderstood. The rules refer to “hypertension, treated, with medication needing close monitoring” — it appears as a condition to be assessed, not as an automatic bar.

In practice this means a seafarer whose blood pressure is well controlled on a stable dose, with records to show it, is in a far better position than a seafarer who is untreated and reading high on the day. The examiner is assessing control, not the mere existence of a diagnosis.

Which leads to the obvious conclusion that too many candidates get backwards: stopping your tablets before a medical is the worst thing you can do. It does not hide anything. It produces a high reading and removes the one piece of evidence that would have helped you.

What Happens on the Day If Your Reading Is High

A single high reading at the start of an examination is common and is not treated as a verdict by a competent examiner. The normal sequence is:

1. Rest and repeat. You are asked to sit quietly for a period, without talking, without your phone, feet on the floor, and the reading is taken again. Travel, stairs, caffeine and nerves all push the first reading up.
2. Repeat on the other arm, or later in the visit. Readings are often taken more than twice, spread across the examination.
3. Review of history and medication. If you are on treatment, your prescription and recent readings matter here.
4. A decision. If it settles within the standard, the examination continues normally. If it stays above, the usual outcome is a temporarily unfit finding with a defined route back — not a permanent bar.

What a temporarily unfit finding means in practice is covered in our guide on why seafarers are declared unfit and how to pass. The short version: ask the examiner exactly what needs to change, by when you can be reassessed, and get that in writing.

Preparing Your Blood Pressure Properly

There is an honest version of this and a dishonest version. The dishonest version — crash measures in the last 24 hours, borrowed tablets, dehydration tricks — is both unsafe and usually ineffective, and it leaves you with an uninvestigated medical problem on a ship. Here is the version that actually works.

Four to six weeks before

• Get it measured, properly, more than once. Any pharmacy or clinic will do it. Three readings on three different days tell you far more than one. If they are consistently high, you have found a real problem early, which is exactly when it is easiest to deal with.
• See a doctor if the numbers warrant it. Hypertension that is identified and treated six weeks before a medical is a manageable situation. The same hypertension discovered on the morning of the examination is a lost joining date.
• Reduce salt in a sustained way — pickles, papad, packaged snacks, restaurant food and added table salt are the usual culprits in an Indian diet.
• Walk. Regular moderate activity lowers blood pressure measurably over weeks. It does nothing in two days.
• Cut back on alcohol and tobacco. Both raise blood pressure, and tobacco affects several other parts of the examination too.

The night before and the morning of

• Sleep. A night on a train or a late journey reliably raises readings. If you are travelling into Delhi for the medical, arriving the previous evening is worth the cost of a room.
• Skip the morning tea or coffee if you can — caffeine raises blood pressure for a couple of hours.
• Take your regular medication as prescribed, unless your own doctor has told you otherwise. Do not stop it to “look normal”.
• Arrive with time in hand. Rushing in after a traffic jam and sitting straight down for a BP reading is a self-inflicted problem.
• Bring your records — prescription, any home readings, previous medical certificates.

Diabetes: What the Rules Actually Say

Here the position is less numerical and more a matter of assessment, and it is important to be accurate about that rather than repeat numbers that circulate online without any source.

Diabetes mellitus is listed in Annexure A, Section 3 of the Merchant Shipping (Medical Examination) Rules, 2000, among the conditions that generally render a person unfit for work at sea — with the examining doctor able to consider individual circumstances and whether the condition is sufficiently controlled.

Read that carefully, because both halves matter:

• Diabetes is treated as a serious finding, not a minor one. Anyone telling you it does not matter is not being straight with you.
• It is not framed as an automatic, unconditional bar. The examiner assesses the case.

What the examiner is weighing is the thing that matters at sea: can this condition be managed safely, by this person, on a ship, for the length of a contract, without access to a hospital? That question is answered by control and by records, not by the diagnosis alone.

What strengthens a case

• A stable HbA1c over time, with the actual reports, not a single recent test
• A consistent treatment regimen that has not needed frequent changes
• A specialist letter setting out the control achieved and the monitoring in place
• No history of hypoglycaemic episodes, and no complications affecting eyes, kidneys or nerves
• Honest declaration from the start, in your own words, before any test result appears

What weakens it

• A first-time discovery on the day, with no history and no records
• Readings that swing widely, or a regimen that keeps changing
• Any history of blackouts or hypoglycaemia
• An undeclared diagnosis that the blood work then reveals — this is the worst position of all, because it puts your honesty in question alongside your health

One further point, stated plainly because it is widely misreported: the statutory rules do not set out a simple “tablets allowed, insulin not allowed” test. What you will meet in practice is the examiner’s clinical assessment of control and risk, and separately your shipping company’s own policy, which can be stricter than the national standard and often is. If your company has a published medical policy, read it before you book.

The Blood Sugar Tests You Will Actually Have

Blood sugar is not assessed on one number alone, and knowing which tests are involved tells you how to prepare.

Test	What it shows	Why it matters at the medical
Fasting blood sugar	Your glucose after an overnight fast	A snapshot — affected by what you ate last night and how well you fasted
Random blood sugar	Glucose at any time of day	Picks up significant elevation regardless of fasting
HbA1c	Average glucose control over roughly the previous three months	The one you cannot prepare for in a week — and the one that tells the examiner the truth about control
Urine sugar	Glucose spilling into urine	A simple additional signal of significant elevation

The practical consequence of HbA1c being in the panel is simple: there is no short-term fix. Three days of careful eating will move a fasting sugar and will not move an HbA1c at all. If your control has been poor for months, the test will say so. That is not a reason to despair — it is a reason to start three months before the medical rather than three days.

It is also worth noting that the draft Merchant Shipping (Medical) Rules, 2026, published by the Ministry of Ports, Shipping and Waterways for consultation, list random blood sugar and HbA1c explicitly among the mandatory pre-sea investigations. That is a draft and not yet the law in force, but it tells you the direction of travel: HbA1c is becoming a standard part of the examination rather than an optional extra.

Weight, BMI and the Ideal Body Weight Chart

Weight sits alongside blood pressure and sugar because the three travel together, and because it is assessed in its own right.

The approach in the Indian rules is not a single BMI cut-off but a weight proportionate to height and age, assessed against an ideal body weight chart, with a margin of variance allowed. The draft 2026 rules include such a chart in their Appendix A, listing acceptable weight ranges by height for men and women with a stated allowance of around ten per cent, and a separate column marking obesity.

In practice, what this means for a seafarer is:

• There is some tolerance built in — you are not being measured against an athlete’s standard.
• Significant obesity is assessed as a finding in its own right, not merely as a cosmetic matter, because it bears directly on your ability to climb, evacuate and work in an emergency.
• Weight that is well outside the range usually brings blood pressure and blood sugar with it, which is why it so often turns a straightforward medical into a complicated one.

Like HbA1c, this is not a problem that can be solved in the week before a medical. It is, however, one of the most reliably fixable findings over three to six months.

Why Declaring Beats Hiding, Every Time

Seafarers do sometimes consider not mentioning a diagnosis. It is worth being very clear about why that is a bad decision, and not only for ethical reasons.

• The blood work usually finds it anyway. An HbA1c does not care what was written on the form.
• A declared condition is assessed; an undeclared one that surfaces is a credibility problem on top of a medical one, and that is a much harder position to recover from.
• It can invalidate the certificate later. A fitness certificate obtained on an incomplete declaration is exposed if the condition comes to light during a contract.
• At sea, you are the one who carries the risk. A hypoglycaemic episode in an engine room, or a hypertensive crisis mid-ocean, is survived or not survived on the basis of what the ship knows about you.

A well-controlled, properly documented condition is a routine matter for an experienced examiner. A concealed one is not.

A Realistic Timeline Before Your Medical

When	What to do
3 months before	Get an HbA1c and a fasting sugar if you have any history or family history. This is the only window in which HbA1c can still be improved.
6 weeks before	Check blood pressure on three separate days. If consistently high, see a doctor now rather than later.
4 weeks before	Begin sustained changes — salt, walking, alcohol, tobacco. Get a dental check while you are at it.
2 weeks before	Collect your records: prescriptions, specialist letters, previous certificates, home readings.
1 week before	Book the medical with a day or two of margin before your joining date, in case a test needs repeating.
Night before	Sleep properly, no alcohol, confirm the fasting window, keep taking prescribed medication.

That last row is worth repeating in its own right. Booking the medical for the day before sign-on leaves no room at all. A single repeat test, which is the most common outcome in borderline cases, then becomes a lost contract. Our guide to certificate validity and expiry explains how to plan renewals so you are never in that position.

Where This Is Assessed in Delhi

Seafarer medicals must be conducted and signed by a medical examiner approved by the Directorate General of Shipping. At Edge Marine Medicals in West Delhi, examinations are conducted by Dr. Nishant Thapar, MBBS, MD (Radiodiagnosis), under approval reference DEL/WES/0005/2026 — which you can and should confirm yourself in the Registered Medical Practitioners directory on the DG Shipping eSamudra portal before booking anywhere. Our step-by-step guide explains how to verify a DG Shipping approved doctor.

Two things matter specifically for blood pressure and sugar cases:

• A proper rest and repeat protocol. A borderline reading taken once, in a corridor, immediately after you have climbed a flight of stairs, is not a fair assessment of your blood pressure. It should be repeated after rest, and more than once.
• In-house pathology. When the laboratory is in the same building, a sugar reading that needs confirming can be confirmed the same morning instead of becoming a second visit on another day.

The full process, the complete test panel and same-visit certification are set out on our DG Shipping approved doctor in Delhi page, and if you are based on the western side of the city, see our guide to the DG approved doctor in West Delhi, Rajouri Garden and Raghubir Nagar.

Frequently Asked Questions

1. What is the blood pressure limit for a merchant navy medical?

Under Annexure B, Section 7 of the Merchant Shipping (Medical Examination) Rules, 2000, the standard is not met at or above 150/90 mmHg for a new candidate, 160/100 mmHg for a serving seafarer under 50, and 175/100 mmHg for a serving seafarer over 50. Shipping companies and flag States may apply stricter limits.

2. Can I join the merchant navy if I have high blood pressure?

Possibly. Treated hypertension is not framed as an automatic bar; the rules describe it as a condition requiring close monitoring. What matters is whether your blood pressure is controlled, whether you have records to show it, and which category of candidate you are. Untreated, uncontrolled hypertension is the real obstacle.

3. Should I stop my BP tablets before the medical?

No. Take your medication exactly as prescribed unless your own doctor tells you otherwise. Stopping it does not conceal anything, it produces a higher reading, and it removes the evidence that your condition is controlled. It is also unsafe.

4. My BP was high at the start of the examination. Is that an automatic fail?

No. A first reading is commonly elevated by travel, stairs, caffeine and nerves. A proper examination rests you and repeats the reading, usually more than once. Only a reading that stays above the standard after rest leads to a finding.

5. Is diabetes a disqualification for seafarers in India?

Diabetes mellitus is listed in Annexure A of the Merchant Shipping (Medical Examination) Rules, 2000 among conditions that generally render a person unfit, with the examining doctor able to consider individual circumstances and the degree of control. It is treated as a serious finding, but it is assessed rather than applied as an unconditional bar.

6. Is insulin allowed in the merchant navy but tablets not, or the other way round?

The statutory rules do not set out a simple tablets-versus-insulin test. What applies is the examiner’s assessment of control and risk, together with your shipping company’s own medical policy, which is often stricter than the national standard. Ask your company for its policy in writing before you book.

7. What HbA1c do I need for a seafarer medical?

No single statutory HbA1c cut-off is published in the rules; the examiner assesses control in the round, alongside your history, records and other results. What is clear is that HbA1c is becoming a standard investigation — the draft Merchant Shipping (Medical) Rules, 2026 list random blood sugar and HbA1c among mandatory pre-sea investigations.

8. Can I improve my HbA1c before the medical?

Only over months. HbA1c reflects roughly three months of glucose control, so short-term dieting will not move it. If you have any history or family history, test it three months before your medical, not three days.

9. What if I am found to have diabetes or hypertension for the first time at the medical?

The usual outcome is a temporarily unfit finding with a route back: get the condition assessed and treated, build a record of control, and return for reassessment. Ask the examiner precisely what is required and by when, and get it in writing.

10. Does being overweight fail a seafarer medical?

Weight is assessed as proportionate to height and age against an ideal body weight chart, with a margin of variance allowed, and obesity is recorded as a finding in its own right. It matters because it affects your ability to work and evacuate in an emergency, and because it usually brings blood pressure and sugar with it.

11. Will drinking a lot of water or skipping meals lower my readings on the day?

Not usefully, and some of what circulates on this is unsafe. Follow the fasting instruction you are given, take prescribed medication, sleep properly and arrive rested. Those are the only same-day measures that genuinely help.

12. Does the standard differ for a fresh candidate and a serving seafarer?

Yes, and substantially for blood pressure. A new candidate is assessed at 150/90 mmHg, a serving seafarer under 50 at 160/100 and over 50 at 175/100. If this is your first medical, you are being held to the strictest of the three.

13. What records should I bring if I have either condition?

Your prescription, recent laboratory reports including HbA1c, any specialist letter describing your control and monitoring, home blood pressure readings if you keep them, and your previous medical certificate. Records are what turn a diagnosis into a manageable case.

14. Are new medical rules coming for Indian seafarers?

A draft of the Merchant Shipping (Medical) Rules, 2026 has been published by the Ministry of Ports, Shipping and Waterways. It is a draft and not the law currently in force, but it makes random blood sugar and HbA1c explicit mandatory investigations and includes an ideal body weight chart. Confirm the position in force with an approved examiner before relying on it.

Book Your Seafarer Medical in West Delhi

If you have a known blood pressure or sugar problem, say so when you book. It is not a reason to be turned away — it is a reason for us to plan the visit properly, repeat readings fairly, and get the laboratory work done early enough to confirm anything borderline the same day.

Send us a message with your rank, your shipping company, your joining date, and a note of any condition you are being treated for. We will confirm the panel your company requires, what it includes and what it costs — in writing, before you travel.

???? Call or WhatsApp (marine medicals): 9599941470
???? Visit: Edge Marine Medicals, B-568-569, Raghubir Nagar, Tagore Garden Extension, New Delhi 110027 — next to Rajouri Garden
???? Directions and timings: our contact page

Medically reviewed by Dr. Nishant Thapar, MBBS, MD (Radiodiagnosis), DG Shipping approved medical examiner (Approval No. DEL/WES/0005/2026), Founder and Chief Radiologist, Edge Imaging & Diagnostics. Last reviewed: 1 October 2026.

This article is general information for seafarers. It is not medical advice, it does not replace a consultation or an examination, and it must not be used to self-manage diabetes or hypertension. Fitness standards quoted are those set out in the Merchant Shipping (Medical Examination) Rules, 2000; rules are revised from time to time, a draft of new Rules was published in 2026, and shipping companies and flag States may apply stricter standards. Always confirm the current requirements with a DG Shipping approved medical examiner, and discuss any treatment decision with your own doctor.

Related reading: Why seafarers are declared unfit | Eyesight and vision requirements | The complete DG Shipping approved medical guide | Medical cost in Delhi | Certificate validity