What to Expect at a Blood Draw

A blood draw, also called a venipuncture, is a routine procedure used to collect a sample for hormone and other tests. Knowing what happens before, during, and after can make the experience calmer and more predictable.

Before the appointment

Most of the preparation happens before you arrive. Confirm any instructions from the clinic that ordered the test, such as whether you need to fast, whether the sample should be taken at a particular time of day, or whether cycle timing matters. Bring a current list of medications and supplements, and a form of identification if the clinic requires it. The guide on how to prepare for a hormone test covers timing and fasting in more detail.

• Wear a top with sleeves that roll up easily.
• Drink water beforehand unless you have been told to fast from water too, since being well hydrated can make veins easier to find.
• Let the staff know in advance if you have fainted during blood draws before or feel very anxious.

During the draw

The person who takes your blood is often a phlebotomist, a professional trained specifically for this. They will usually have you sit with your arm supported. The typical steps are:

1. An elastic band (tourniquet) is placed around your upper arm to make the veins easier to see and feel.
2. The skin over the chosen vein, often in the crook of the elbow, is cleaned.
3. A thin needle is inserted into the vein, and one or more tubes are filled. You may feel a brief sting or pinch.
4. The tourniquet is released, the needle is removed, and pressure is applied with a cotton ball or pad.
5. A small bandage is placed over the site.

The actual draw is usually quick, often a minute or two once the needle is in. The number of tubes depends on how many tests were ordered, and filling several tubes is normal.

If you find blood draws difficult

Many people feel anxious about needles, and there are practical ways to make it easier. Telling the phlebotomist you are nervous lets them work with you. Looking away from the needle, breathing slowly, and staying well hydrated can all help. Some people who tend to faint benefit from lying down for the draw. None of this is unusual, and good staff are used to helping people through it.

After the draw

Keep gentle pressure on the site for a short time, then keep the bandage on for a little while as advised. A small bruise can sometimes appear, which is generally minor and fades on its own. You can usually return to normal activities, though if you fasted you may want a snack afterward. If you were told to resume any medication you held for the test, follow those specific instructions.

• Avoid heavy lifting with that arm for a short period if advised.
• Keep the area clean and watch for unusual redness, swelling, or pain.
• Contact the clinic if you have significant or worsening symptoms at the site.

Getting your results

Results are typically sent to the clinician who ordered the test and may also appear in a patient portal. The time this takes varies by test and laboratory. When results arrive, the guides on how to read your hormone lab results and understanding hormone test units can help you make sense of the report before you discuss it with your clinician. You can also browse more guides or the blood tests section.