MD, MS, DNB, DrNB, DM and MCh all require a thesis or dissertation, and residents often assume the requirements are broadly the same. They are not, because the documents are not governed by the same body. The practical differences are in who approves your protocol, when the clock starts, and to whom the finished thesis goes.
Who sets the rules
For MD, MS, DM and MCh at a medical college affiliated to a university, two authorities apply at once. The National Medical Commission's Post Graduate Medical Education Regulations 2023[1] set the national framework, and your university sets the detail: the template, the internal deadlines, the number of copies, the wording of the certificate, the similarity report it will accept and the committee that clears your protocol. Where the university is stricter than the framework, the university governs what you actually hand in.
For DNB and DrNB there is one authority for both halves. The National Board of Examinations in Medical Sciences[2] sets the calendar, receives the protocol and the thesis through its own portal, appoints the assessors, and conducts the examination. There is no affiliating university in between, which makes the process more uniform across the country and considerably less forgiving about dates.
MD and MS
Regulation 5.2(ii) of PGMER-2023 keeps the thesis compulsory for every broad-specialty postgraduate. It is assessed within the practical and viva examination, carries 20 marks, and is judged by an external examiner from outside the state. Regulation 5.2(x) additionally requires at least one research activity before the final examination, a poster or oral presentation at a state-level or higher conference or a first-author paper, alongside a research methodology course, Good Clinical Practice training and a maintained e-logbook.
The Commission's clarifications issued in April, June and August 2024 confirmed that prior acceptance of the thesis is not a prerequisite for appearing in the final examination. Submission still runs through your head of department and the dean, and universities still set their own internal cut-off, commonly several months before the examination. That internal date, not the national framework, is the one you plan against, and it is the one you should have in writing from your department in your first year.
DNB and DrNB
The NBEMS thesis guidelines run the tightest calendar in Indian postgraduate medicine, and each date is enforced rather than advisory. For three-year courses, the protocol with institutional ethics committee approval is uploaded on the NBEMS portal within 180 days of joining. Data collection completes by 24 months. The thesis is submitted for assessment by 26 months, with a late window at 27 months on payment of a fee. Submissions are capped at 80 pages, and assessors' remarks must be addressed in a modified thesis within six weeks. Fees, forms and page limits are revised from time to time, so read the current guideline document on the NBEMS portal rather than relying on a senior's copy, and if your course is not a three-year DNB or DrNB, confirm which dates apply to your duration.
The structural difference that matters most: for DNB and DrNB the thesis is assessed separately and in advance of the examination, by assessors you never meet, working from the document alone. Nothing you say later can compensate for something the document fails to explain. For MD and MS the thesis and the person arrive together in front of an external examiner. Both routes reward a clear methods chapter, but the NBEMS route punishes an unclear one harder.
DM, MCh and super-specialty DrNB
A super-specialty dissertation is governed the same way as the broad-specialty thesis of the same stream, by the university under the NMC framework for DM and MCh and by NBEMS for DrNB, and the thesis requirement is not waived at this level. What changes is the nature of the question. The population is narrower, sometimes a few dozen patients a year in the whole unit, so feasibility stops being a formality and becomes the design constraint. A three-year window does not help if the condition presents a handful of times a year in the unit.
In practice that pushes super-specialty dissertations towards a registry-style prospective cohort, a well-defined retrospective series with a clean protocol for record access, or a narrowly framed comparison of techniques already in routine use in the unit. The expectation of depth is higher, because a super-specialty examiner may be one of a small number of people in the country working on your exact question and may know the literature as well as you do. The detail of length, format and the number of copies is, again, set by the individual university, and a university may ask more of a super-specialty dissertation than of an MD or MS thesis, so confirm what applies to your own course.
What differs in practice
- Protocol approval: your university or institutional committee for MD, MS, DM and MCh; the NBEMS portal, after institutional ethics committee clearance, for DNB and DrNB.
- When the clock starts: a national 180-day protocol deadline for DNB and DrNB; a university-set date for MD and MS, which you must obtain locally.
- Who assesses: an external examiner within the practical and viva examination for MD and MS; NBEMS-appointed assessors in advance of the examination for DNB and DrNB.
- Marks: 20 marks within the clinical assessment under PGMER-2023 for MD and MS; for DNB and DrNB the thesis is assessed separately, and the NBEMS examination information bulletins make submission by the stated deadline a condition of eligibility for the final theory examination.
- Length: an 80-page cap under the NBEMS guidelines; a limit set by each university, or none stated, for MD and MS.
- Modification: six weeks from the assessors' remarks under NBEMS; a route and a timeline set by your university otherwise.
What is the same everywhere
- Institutional ethics committee approval must precede data collection, as the ICMR[5]'s 2017 national ethical guidelines require, and prospective interventional studies are registered with the Clinical Trials Registry of India.
- Informed consent, documented in the language the participant actually speaks, or a committee-granted waiver on the record.
- One objective that maps to one outcome and one analysis, and a sample size with a formula, assumed values and a cited source.
- A similarity check. Universities following UGC 2018[3], the University Grants Commission's plagiarism regulations, treat similarity under 10% as acceptable; for DNB and DrNB, read what the current NBEMS thesis guideline asks for rather than assuming the university convention applies to you.
- Vancouver[4] numbered referencing, unless your template specifies otherwise.
- You are the sole author. A guide, a co-guide, a statistician and an editor may all contribute, and none of them becomes an author of your thesis.
Which set of rules applies to you
Work from the body that will issue your degree, not from the hospital you are training in. A resident in a DNB seat at a large private hospital follows NBEMS even though the hospital also trains MD residents under a university; a resident in an MD seat at the same hospital follows the university. If you are unsure, your joining letter and your registration documents say which, and the difference decides every deadline in the next three years.