How do you hydrate for a blood draw?

Ideally, start drinking more fluids the day before your blood draw, and continue to drink water before you have your blood drawn. Excessive amounts aren't necessary; most sources ecommend that an adult drink 64 ounces of water per day for good health, which is more than adequate for having your blood drawn.

northbay.org - How to Prepare to Have Your Blood Drawn - NorthBay Healthcare

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One of the most important things you can do to prepare for having your blood drawn, is to make sure you are well hydrated. “If you're having blood drawn, unless you've been told not to eat or drink anything by your provider make sure you are well-hydrated,” says Jerry Simmers, director of laboratory services at NorthBay Healthcare. “A ‘fasting’ blood sample normally means no food and flavored drinks for 12 hours, because it may affect some lab tests such as glucose or cholesterol, however drinking water does not affect the results of those tests,” he noted Being well-hydrated makes it far easier for the person who is taking the patient’s blood to find a vein that can easily be punctured and far easier for the patient because their veins will be much easier to find and access, explained Simmers. Ideally, start drinking more fluids the day before your blood draw, and continue to drink water before you have your blood drawn. Excessive amounts aren't necessary; most sources ecommend that an adult drink 64 ounces of water per day for good health, which is more than adequate for having your blood drawn. Limit caffeine, which acts as a mild diuretic increases the amount of urine you produce.

Simmers offered the following tips for patients:

1. Breathe

Don't hold your breath while your blood is being drawn. Some people hold their breath in anticipation of the insertion of the needle, which doesn't help at all if you're feeling faint. Keep breathing at your normal rate and depth, and you'll be far less likely to feel lightheaded during a blood draw.

2. Be Honest

If you are someone who has fainted in the past when donating blood or having your blood drawn, be sure to tell the person who will be drawing your blood. If there is the slightest chance of fainting during a blood draw, positioning is key. Both of NorthBay’s laboratories have special chairs that completely recline and allow you to lie down during the blood draw.

3. Don't Look

If having your blood drawn makes you feel queasy, don't watch while your blood is drawn. For some, the sight of blood is the problem, so not watching while blood is collected can easily solve that problem. Look away, and concentrate on whatever will distract you from the procedure.

4. Sit Still

If you're moving and wiggling while someone is attempting to draw your blood, it's likely that he will have to make more attempts to obtain the sample. Sit as still as possible. Even if you are nervous, it's important to refrain from wiggling and fidgeting or you could potentially add to the number of pokes required to draw your blood.

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Does drinking water increase hemoglobin?

In conclusion, a steady intake of water may reduce anemia and CVD risk by increasing hemoglobin synthesis and decreasing MPV; it may also enhance humoral immunity by increasing IgG levels.

kjcls.org - Changes in the Blood Components Caused by Water Intake

물은 생체에 필수적인 성분이고 많은 생리학적 과정에 관련되어 있음에도 불구하고 물을 꾸준히 충분하게 섭취하는 것이 혈액 성분에 어떤 영향을 미치는지에 대해서는 잘 알려져 있지 않다. 따라서 이 연구에서는 13명의 정상 성인에게 물을 섭취하게 한 후에 혈액학적, 고감도 C 반응성 단백질(hs-CRP), 면역글로불린 G (IgG)의 변화를 측정하였다. 4명의 대조군은 물을 자유롭게 마시게 하였고 9명의 실험군은 시판되는 생수를 매일 2 L씩 마시게 하였다. 2주 후에 혈액을 채취하여 검사한 결과, 혈구 세포 수, 적혈구 용적률, 혈색소 수치는 증가했지만 유의성은 없었다( p >0.05). 그러나 평균 혈색소량(MCH)과 평균 혈색소 농도(MCHC)는 각각 의미 있게 증가하였고( p <0.05, p <0.01), 평균 혈소판 용적(MPV)은 의미 있게 감소하였다( p <0.05). 심혈관 질환의 표지자로 쓰이는 면역학적인 검사항목인 hs-CRP는 물 섭취 후에 감소하는 것으로 나타났으나 유의한 차이는 없었다( p >0.05). 그러나 IgG의 농도는 물 섭취 전에 비해 상당히 유의성 있게 증가하는 결과를 나타냈다( p <0.05). 결론적으로, 꾸준히 충분하게 물을 섭취하면 혈색소 수치가 증가하여 빈혈이 완화될 수 있고 혈소판 활성과 hs-CRP가 감소하여 심혈관 질환의 위험을 줄일 수 있다. 또한 체액성 면역 성분이 증가하여 면역 기능이 향샹될 수 있다.

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