Hi [Manager], I have a fasting blood test first thing on [day] and will be in by [time]. I will make up the short gap.
Blood test
Leaving for a Blood Test: How to Tell Your Manager
Many blood tests are fasting and only offered first thing, so you may arrive late rather than leave early. Either way a short note works.
Say when, not why
A blood test or lab appointment is a complete reason; you do not need to explain what is being checked. Give the time you will be out or arriving late and confirm your work is covered.
Plan around a morning slot
Because fasting tests run early, it is often cleaner to come in a little late than to break up the afternoon. Say which you are doing and offer to make up the short gap.
Example messages
Hi [Manager], I have a lab appointment and need to step out around [time]. I will be back and my priorities are covered.
Hi [Manager], I have a quick medical test booked for [time] tomorrow and will be in a little later than usual.
Mistakes to avoid
Do not describe symptoms or results, and do not leave it unsaid until you are missing. A one-line heads-up about arriving late or stepping out is all it takes.
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This page shares wording ideas, not legal or HR advice. Follow your own employer's time-off policy.
Common questions
Should I come in late or leave early?
For a fasting morning test, arriving a little late is usually the least disruptive. Say which you are doing.
Do I owe an explanation?
No. A blood test or medical appointment is a complete, professional reason on its own.