Prothrombin time (PT) is a blood test that measures the time it takes for the liquid portion (plasma) of your blood to clot.

Prothrombin time (PT) is a blood test that measures the time it takes for the liquid portion (plasma) of your blood to clot. A prothrombin time test can be used to check for bleeding problems. PT is also used to check whether medicine to prevent blood clots is working. A PT test may also be called an INR test. INR stands for 'international normalized ratio'.

Free PSA (% free PSA or PSA, % free) expresses what percentage of your total PSA is circulating unbound. Prostate cancer tends to produce more bound PSA, lowering the free percentage. Benign prostate enlargement (BPH) tends to produce more free PSA, raising the percentage. The 25% threshold is commonly used: a % free PSA above 25% is associated with lower cancer probability; below 10% is associated with significantly elevated cancer risk. The test is most clinically useful when total PSA falls between 4–10 ng/mL. Age affects interpretation — cancer risk at the same % free PSA increases as men get older.

Pseudoflavonifractor spp. has been positively associated with weight loss.

- Gram-negative bacteria in the Proteobacteria phylum.

- Pseudomonas aeruginosa are normal flora in the human gastrointestinal (GI) tract, which on occasion cause GI tract infection.

- Gram-negative bacteria in the Proteobacteria phylum.

- Pseudomonas aeruginosa are normal flora in the human gastrointestinal (GI) tract, which on occasion cause GI tract infection.

Gram-negative bacteria in the Proteobacteria phylum. High levels may indicate increased intestinal inflammatory activity and may cause abdominal cramping and loose stools. Some strains of P. aeroginosa may produce toxins that can damage cells.

Parathyroid hormone (PTH) antibodies are specialized monoclonal or polyclonal antibodies engineered to specifically bind to parathyroid hormone—a critical regulator of calcium and phosphorus balance in the human body. These antibodies are widely utilized in both biomedical research and clinical diagnostics to detect, measure, and study PTH levels in biological samples.

Biological Role of PTH

Parathyroid hormone is an 84-amino acid polypeptide secreted by the parathyroid glands. It plays a vital role in calcium and phosphate homeostasis through three main mechanisms:

• Stimulating bone resorption to release calcium into the bloodstream

• Enhancing renal calcium reabsorption to reduce urinary calcium loss

• Promoting activation of vitamin D, which boosts intestinal calcium absorption

Disruptions in PTH production or action can lead to:

• Hypoparathyroidism – low PTH levels, leading to hypocalcemia and hyperphosphatemia

• Hyperparathyroidism – elevated PTH levels, often resulting in hypercalcemia and hypophosphatemia

The PTT-LA Ratio is an essential part of lupus anticoagulant (LA) testing. It is calculated using a modified partial thromboplastin time (PTT) test that employs a low-phospholipid reagent, making it highly sensitive to the presence of lupus anticoagulant. A normal PTT-LA ratio is typically ≤1.20.

An elevated PTT-LA ratio may suggest the presence of lupus anticoagulant—an antibody that paradoxically increases the risk of blood clots, even though it prolongs clotting times in laboratory tests. This test is commonly performed alongside other assays, such as the dilute Russell viper venom time (dRVVT), as part of a comprehensive lupus anticoagulant panel.

PTT-LA Screen is a lupus anticoagulant-sensitive clotting test used to help detect antibodies that may increase blood clot risk. A result above the lab cutoff, commonly greater than 40 seconds, does not diagnose lupus anticoagulant by itself. It usually means follow-up testing such as PTT-LA Mix, dRVVT, or hexagonal phase confirmation is needed.