Reference checks, medical and security clearance: what happens after you accept an offer

A verbal offer, or an email saying you're the recommended candidate, feels like the finish line — but for most UN and IO recruitment it isn't. Between "we'd like to offer you the post" and a signed contract sits a second, quieter process: reference checks, medical clearance, and, for a meaningful share of posts, security clearance. Each can stall or occasionally sink an offer, and almost none of it is explained to candidates in advance. This guide covers what each check actually involves, how long it takes, and what is and isn't within your control once it starts.

For the stages that come before this point — screening, testing, the panel interview — see the complete field guide; for how the overall clock runs end to end, see the recruitment timeline guide. This page focuses specifically on post-offer clearance.

Where clearance sits in the process

Reference checks often start earlier than candidates assume — many organizations contact referees in parallel with the panel interview or shortly after it, rather than waiting for a final decision. Medical and security clearance, by contrast, almost always start only after a candidate has been formally identified as the preferred candidate, because they are administratively costly and organizations run them for one person at a time, not for a whole shortlist. A "verbal offer" or "conditional offer" is the usual trigger: it is real, but it is conditional on these checks clearing, which is why it isn't yet a contract.

How reference checks actually work

Most organizations contact two to three references directly — by phone or a structured written questionnaire — rather than accepting reference letters supplied by the candidate. Common practice:

• References are usually specified. Many vacancy processes require at least one reference to be a direct former or current supervisor, not a peer or a personal contact; a reference list of only colleagues or friends is often sent back for correction.
• Questions track the same competencies as the interview. Referees are typically asked to rate or describe the candidate against the same competency framework the panel used, plus factual questions (dates of employment, role, reason for leaving), so an interview answer that isn't backed up by a referee's account is a real risk.
• Unresponsive referees are the most common delay. A reference who doesn't return calls or emails for one to two weeks is an ordinary, unglamorous cause of stalled offers — candidates can often speed this up by giving referees advance notice that HR will be in touch.
• A negative or inconsistent reference can end an offer. It's uncommon relative to the volume of hires, but organizations do withdraw conditional offers over a reference that contradicts the application or interview record, particularly on integrity or conduct grounds.

Medical clearance

Most UN and IO staff appointments — though generally not short-term consultancy contracts — require medical clearance before the contract is signed, run through the organization's own medical service or a contracted occupational-health provider rather than your personal doctor:

• A standard medical exam and questionnaire is the baseline for most staff posts: a general physical, standard blood work, and a self-reported health history form reviewed by the organization's medical officer.
• Hardship and non-family duty stations often require more. Postings to higher hardship-classification or non-family duty stations — see the duty station classification guide — can require additional tests, dental clearance, or a medical-evacuation fitness assessment, since the organization needs assurance a condition won't require an emergency evacuation from a location with limited local care.
• Clearance is about fitness for the specific post, not a pass/fail on health generally. A disclosed condition does not automatically disqualify a candidate; the medical service assesses fitness for the specific duty station and role, and can clear a candidate with conditions or accommodations attached rather than an outright refusal.
• It takes longer than a single appointment. Between scheduling the exam, lab turnaround, and the medical officer's written clearance, this stage commonly runs two to six weeks, longer if follow-up tests are requested.

Security clearance

Not every post requires a formal security clearance — it is most common for posts in the UN Secretariat, peacekeeping and political missions, roles with system access to sensitive information, and assignments to duty stations with an active security phase. Where it applies:

• It typically means a background and records check, not a full national-security-style investigation: verification of identity, employment and education history, and a check against relevant records, run by the organization's own security or vetting unit.
• Some duty stations add a country security clearance. Missions and field duty stations under active security management may require country-specific clearance from the organization's security division before travel authorization is issued, separate from the personnel-level background check.
• It runs in parallel with, not instead of, medical clearance. For posts requiring both, expect the two processes to overlap rather than run one after the other, though either can become the longer pole depending on the specific duty station.

Misconduct disclosure and safeguarding checks

Across the UN system and most major INGOs, an additional check has become close to universal regardless of whether the role is child-facing: a search against the Misconduct Disclosure Scheme, an inter-agency database that flags prior findings of sexual exploitation, abuse or harassment at a previous employer in the sector. Candidates are typically asked to consent to this check and to disclose any prior findings themselves; an undisclosed finding that later surfaces in the database is treated as a serious integrity issue independent of the underlying conduct. This sits alongside, not instead of, the standard reference and background checks described above — see the NGO and INGO recruitment guide for how this plays out specifically in the humanitarian sector.

How long clearance typically adds to the timeline

These stages often overlap rather than run strictly in sequence, so the total is usually shorter than adding every row together — but planning a start date, a notice period at a current job, or relocation logistics around the fastest possible outcome is a common and avoidable source of stress.

What's in your control while clearance runs

• List responsive, well-briefed references. Choose referees who will actually answer promptly, and tell them in advance, in writing, roughly when and how HR will contact them.
• Book the medical exam immediately once asked. Scheduling delay on the candidate's side is one of the few parts of this stage you fully control; provider appointment availability is often the binding constraint, so requesting a slot the same day you're cleared to book usually saves the most time.
• Disclose accurately rather than strategically. Medical and background disclosures are cross-checked against documentation later; an inconsistency discovered after the fact is a bigger risk to an offer than most disclosed conditions ever were on their own.
• Don't resign or relocate on a verbal offer alone. Because clearance can occasionally end an offer, most experienced candidates wait for the organization's written, signed contract — not the conditional offer email — before giving notice at a current job or committing to nonrefundable relocation costs.
• A reasonable check-in is fine. As with the interview-to-offer wait covered in the recruitment timeline guide, one polite status check with your HR contact is normal; clearance stages genuinely can't be rushed by asking more often.

Once clearance is done, the contract itself is usually the fastest remaining step. Browse current vacancies across the board, or go back to the complete field guide for how the stages before this one are actually assessed.