As a surgery date approaches, most people go through a set of checks often called a preoperative evaluation. These usually include blood tests, a urine test, an electrocardiogram (ECG), and a chest X-ray, and their purpose is to see in advance whether the body is ready to handle anesthesia and surgery. When the results come back, it is common to find a few items flagged with an arrow as "outside the normal range." Many people worry this means the operation will be called off, but a single value that sits a little outside the reference range does not automatically cancel surgery.
A urine test that shows a trace of protein or a high level of white blood cells (leukocytes) can happen for several reasons. Vaginal or other secretions can mix into the sample during collection, dehydration, fever, or recent exercise can cause a temporary change, and it may also be related to inflammation in the bladder or urinary tract. A high white-cell count in urine can be a sign that the body is fighting something in that area, so the care team usually looks at the symptoms together with a urine culture before deciding whether an infection is present and whether more treatment is needed.
The enzymes AST and ALT, often referred to together as "liver numbers," live inside liver cells and leak into the blood when the liver is under stress, pushing the values up. However, these numbers can rise not only from liver disease but also from medications a person is taking, recent alcohol, strenuous muscle exercise, fatty liver, or a passing change in overall condition. Because of this, one reading alone rarely pins down the cause; the medical team weighs how high the values are, other liver-related tests, and whether there are any symptoms to decide whether further testing is needed or whether watchful follow-up is enough.
Whether surgery goes ahead as planned, or is postponed or adjusted, is not decided by a single result sheet but by the team as a whole, including the anesthesiologist and the operating surgeon. If an infection is suspected, they may want to finish treating it before surgery; if the liver numbers are markedly high, they may order more tests to find the cause. On the other hand, mild abnormalities often do not change the surgical plan much. If inflammation still seems to be present even after a course of antibiotics for something like cystitis, it is safer to report the current urine result and any lingering symptoms to the clinician who prescribed the medication, and decide the next prescription or test together, rather than restarting medicine on your own.
When you go over the results in the clinic, it helps to jot down and ask which values are off and by how much, whether they affect the surgery schedule, whether any extra tests or treatment are needed before the operation, and whether there are medicines you should keep taking or stop. Sharing your worries with the team, rather than carrying them alone, tends to ease both the mind and the preparation.
This article is for general information only and does not replace individual diagnosis or treatment. Please discuss the meaning of your test results and whether to proceed with surgery with your own medical team.