Reasons and countermeasures for unqualified clinical specimens

According to statistics, the unqualified specimens of blood cell analyzers account for about 4.54% in clinical practice. The direct harm caused by unqualified specimens is: unqualified specimens – reporting errors – misleading the doctor’s diagnosis – delaying the best treatment time – patient complaints – medical disputes. Common reasons are as follows:
1. The blood drawing method is wrong, the blood drawing is not smooth, and the technology is not enough
Countermeasures:
a. Collect blood from veins as much as possible, and use peripheral blood if necessary, such as infants, patients with extensive burns, and some cases that require frequent blood collection, such as leukemia, tumor radiotherapy and chemotherapy patients, etc., and indicate the blood type for comparative observation.
b. It is forbidden to collect blood from feces infusion, especially from the same side of the infusion.
2. Wrong anticoagulant, insufficient mixing or improper proportion
This situation is relatively common. At present, EDTA-2K is mostly used, and the correct concentration is 1.5mg/ml blood. It is usually formulated into 15g/L, and 0.1ml is added to each tube, which is equivalent to 1.5mg, which can anticoagulate 1ml of blood. Dry roasting at 100 ℃ does not affect the anticoagulation ability.
Improper ratio of anticoagulant can lead to two situations: a. Excessive anticoagulant: when it reaches 2.5mg/ml blood, it can cause swelling of blood cells, affecting counting and classification. b. Insufficient anticoagulants: can cause blood to clot or microclots, block tubing, and count errors. It is recommended to choose a vacuum anticoagulation tube. Because of the obvious color mark, it is convenient to choose, and it can also effectively avoid the hemolysis of the specimen caused by the syringe injection.