Yes, your period can affect blood test results, especially for hormones, iron, and inflammation markers, due to natural fluctuations in estrogen, progesterone, and blood loss, though routine tests like basic metabolic panels are usually fine. Timing is crucial for hormone panels (like FSH, LH, estradiol), which vary significantly across the cycle, while iron studies (ferritin, hemoglobin) might show lower levels due to menstrual bleeding. Always inform your doctor about your cycle phase for accurate interpretation, as they might ask you to time tests for specific days.
Routine blood tests: Most standard tests (like blood sugar, cholesterol, liver and kidney function) are not significantly affected by menstruation. Hormone-related tests: If tests include hormones such as FSH, LH, or estradiol, timing in the menstrual cycle matters, and your doctor might recommend specific days.
The menstrual cycle can affect biomarkers because it changes hormone levels, which can cause changes in cholesterol levels, inflammatory markers, glucose tolerance, micronutrients, and more. For accurate and comparable results it's important that take blood tests at the same point of the menstrual cycle.
For general health checks like a CBC or lipid profile, it's often best to wait a few days after your period ends. This timing helps avoid the variations caused by menstrual bleeding and provides a more stable baseline for evaluation.
Don't Exercise For Accurate Blood Test Results
A workout can negatively impact blood test results. For the most accurate blood test results, your blood should be drawn when you're rested, Dr. Krajcik says. A workout before a fasting blood test can alter the results of cholesterol and glucose tests.
Hemoglobin, ferritin, and percent transferrin saturation are usually lower in samples collected from females during the luteal phase of the cycle. [3] In other words, your iron status can be lower if you do a blood test during a period.
How much does hemoglobin drop during a period? A 2023 study of 31 females found hemoglobin (a protein in red blood cells) levels dropped from an average of 13.1 grams per deciliter (g/dL) to 11.9 g/dL after menstruation.
We conclude that, during menstruation, there is an increase in the total leukocyte count in the body and this increase is as a result of the increase in the granulocytes. Age and the duration of menstruation influence the increase in the total and differential leukocyte count in the body during menstruation.
But a type of anemia that's common with heavy periods is iron deficiency anemia. Heavy periods lead to blood loss over a long time. This depletes your body's iron stores. With iron deficiency anemia, you might feel tired all the time, weak, dizzy or short of breath, among other signs and symptoms.
Significant weight loss and anemia can also cause your period blood to become pink, although these conditions will likely present with more noticeable signs and symptoms.
Occasionally, it can cause chest pain, a fast heartbeat and shortness of breath. Or it can cause you to crave non-food items like ice, dirt or paper. These are all signs of iron-deficiency anemia. The good news is that treatment can help iron-deficiency anemia.
Iron is depleted by blood loss (heavy periods, bleeding ulcers, surgery), increased demand (pregnancy, growth spurts, intense exercise), poor dietary intake, and conditions that hinder iron absorption (celiac disease, gastric bypass, some medications, or certain foods/drinks like tea/coffee/dairy with meals). Exercise can cause loss through sweating, red blood cell damage (hemolysis), and increased needs, while poor absorption is a major factor, even with good intake.
Causes of White Blood Cell Disorders
Common leukemia signs and symptoms include:
Progesterone rises and peaks to prepare for your period when a pregnancy doesn't occur. As a result, your immune system may decrease. According to a 2017 study in Mucosal Immunology, progesterone can lower the ability to fight infections.
Your menstrual cycle influences your mood and energy, and it also affects your bloodwork. While it's perfectly safe to do a blood test during your period, the timing changes how certain results look and how they're interpreted.
If you have anemia due to heavy menstrual bleeding, you may need to take iron supplements. If your iron levels are low but you're not yet anemic, you may be started on iron supplements instead of waiting until you become anemic.
Published informa- tion on iron loss at menstruation shows an extremely wide range, from less than 4 mg. to more than 50 mg. per period.
These are usually notes which the computer generates if a blood test result is abnormal, or out of 'normal range'. Understandably, this can make you feel worried. But you can be reassured that these flags will be reviewed by your GP or other health professional, who will let you know if there is a cause for concern.
Before a blood test, you should not eat, drink (except water), smoke, chew gum, or exercise, especially if fasting is required, as these can alter results. Avoid alcohol for at least 24 hours and stop certain medications only if your doctor advises, otherwise take them as usual with water. Don't fast longer than recommended (usually 8-16 hours) or shorter than advised, and always check specific instructions with your doctor or lab.
Best Time of Day to Get Blood Work
The morning is usually best, after fasting for at least 8 hours. This ensures accurate results for many tests. The best time for blood work is between 7-10 am. This is when blood glucose and cholesterol levels are most accurate.
ADVICE FOR LADIES
Kindly avoid health screening while you are on your menstrual period. We recommend setting your appointment date to be at least 14 days after the first day of your period. If you are menstruating on the day of your appointment, please inform the doctors during the health screening.
The egg can only be produced by the body during ovulation or the fertile period. However, a positive pregnancy can occur after menstruation if you have unprotected intercourse, whether without using a condom or any other contraceptive method.
If you're bleeding vaginally or are on your period, you can still take a pregnancy test without affecting the result.
A test line can be faint pink if your urine is diluted or it's very early in your pregnancy. Not-to-worry, though. Even a faintly pink-colored test line indicates a positive result. Simply put, if there is color on the test line, it's time to check in with your doctor to confirm a pregnancy.