Can I dye and perm my hair before the physical examination

It is generally not recommended to dye or perm hair before a physical examination. The chemical components in hair dye and perm solution may be absorbed into the bloodstream through the scalp, affecting the accuracy of some physical examination indicators. The chemical preparations used for hair dyeing and perming contain components such as phenylenediamine and hydrogen peroxide, which may interfere with blood test results. Especially in liver function, kidney function, and blood routine tests, chemical metabolites may cause transient elevations in indicators such as transaminase and creatinine. A physical examination should be conducted within 3-5 days after hair dyeing, and residual dye components on the scalp may be mistaken for certain metabolic abnormalities. The reducing agents such as ammonium thioglycolate in hair perm solution may alter the structure of hair keratin, which may affect the items that require hair testing. Some special physical examination items are more sensitive to chemical agents. In tumor marker screening, residual hair dye may cause false positive reactions. Allergic individuals may experience scalp inflammation after dyeing their hair, leading to an abnormal increase in white blood cell count. During imaging examinations such as PET-CT, metallic hair dyes may produce artifacts that interfere with diagnosis. For patients with chronic diseases who require long-term medication, dyeing and perming their hair may increase the metabolic burden on the liver, leading to inaccurate drug concentration testing.

The body should be in a natural state for 7-10 days before the physical examination. Avoid using any chemical hair products and suspend food or health products containing artificial colors. Do not use hair conditioners or styling products when cleaning hair on the day of the physical examination. If you have recently dyed or permed your hair, you need to proactively inform the doctor of the relevant situation for result interpretation. Women preparing for childbirth or pregnancy need to be more cautious, as certain hair dye ingredients may affect fetal development testing through the placenta.