Preoperative Study

CBC, blood group and Rh, glucose, urea, creatinine, sodium-potassium (Na/K), coagulation study (prothrombin time (I.QUICK/INR), activated partial thromboplastin time (APTT) and serum cholinesterase

It is necessary to go with an empty stomach for the extraction of blood. No previous appointment is necessary, the extractions are made from 8:00h – 10:30h from Monday to Friday (children under 5 years old, please consult in advance).

Urinalysis is not necessary.

The results are delivered within 24 hours.

The preoperative is a medical study that is performed before any surgical act. Its main objective is to assess the patient’s health status, in order to avoid possible complications during the operation. This previous study is fundamental to guarantee the safety of the patient before, during and after the operation. 

These are the specific values that are analyzed in the preoperative study: 

  • Hemogram. The hemogram is the part of the analysis that evaluates various parameters of the blood, such as red blood cells, defense cells or white blood cells, as well as platelets and coagulation factors.
  • Blood group and Rh. A blood group is a classification of the blood according to the characteristics present on the surface of the red blood cells and in the blood serum. The two most important classifications for describing blood groups in humans are antigens (the AB0 system) and Rh factor. Rhesus factor (Rh) is an inherited protein found on the surface of red blood cells. If your blood contains this protein, you are Rh positive. If your blood lacks this protein, you are Rh negative.
  • Glucose. Also called glycemia or blood sugar. Useful in detecting and controlling diabetes.
  • Urea is a substance that forms in the body during the processing of proteins and nitrogen compounds in the liver, which we usually excrete through urine and sweat. If it is not eliminated properly, levels rise above normal, causing uremia, which becomes problematic for health, affecting mainly the liver and kidneys.
  • Creatinine is an indicator of kidney function that alerts us if the kidneys are functioning incorrectly. When there is kidney damage the creatinine concentration is elevated. As it is a waste substance that the kidneys must filter and expel through the urine, its presence in elevated levels means that a malfunctioning of the kidneys is taking place.
  • Sodium-potassium (Na/K). The most effective way for our body to function properly is to keep sodium-potassium levels in check.
  • Study of coagulation [prothrombin time (I.QUICK/INR)]. The prothrombin time (PT) test measures the time it takes for a clot to form in a blood sample. The clotting ability is important to prevent excessive bleeding.
  • Activated partial thromboplastin time (APTT). Activated partial thromboplastin time is the time required for fibrin to appear after mixing plasma with platelet phospholipid substitutes. It is used as screening for intrinsic and common coagulation pathways, to monitor treatment with sodium heparin, and to evaluate the presence of lupus anticoagulants.
  • Serum cholinesterase. It is a blood test that studies the levels of 2 substances that help the nervous system to function properly. These substances are called acetylcholinesterase and pseudocholinesterase. Nerves need these substances to send signals.