In clinical practice, peripheral blood (fingertip blood belongs to peripheral blood) and venous blood collected from the same patient at the same time show that peripheral hemoglobin will be higher than venous blood, but the difference will not be very big, and it will not be misleading to the diagnosis, but it is recommended to take venous blood as the standard.
In routine blood tests, peripheral blood and venous blood are the two blood specimens commonly used in clinical practice. Due to the differences in the chemical composition and cellular components of the two specimens, the test results are inconsistent, and in general, the results of peripheral blood erythrocytes, leukocytes, and hemoglobin are higher than those of venous blood, which may be related to the fact that some deposition occurs in the blood extrusion during the collection of peripheral blood, which leads to the local concentration of the blood cells to be elevated.
Although peripheral blood sampling is convenient and has less bleeding, it is easily affected by the depth of puncture, collection location (usually fingertip, earlobe), fingertip temperature, etc., and is unstable, especially when a large number of clinical trials have proved that the longer the peripheral blood is placed, the worse the stability is, which is not conducive to clinical diagnosis. Therefore, if the conditions permit, try to conduct the index test through venous blood.
If abnormal hemoglobin is found, it is usually not related to the error caused by the way of blood collection, and it is recommended to consult a professional doctor for accurate diagnosis and actively cooperate with the doctor’s treatment.