Platelets, also called thrombocytes, are small blood cell fragments that help stop bleeding by forming clots. A platelet count is measured as part of a Complete Blood Count (CBC) and reflects how well the body can control bleeding and clotting. The typical platelet count range for adults is 150,000–450,000 platelets per microliter (150–450 ×10³/µL). Low platelet counts (thrombocytopenia) may increase bleeding risk and can occur with infections, medications, or bone marrow disorders. High platelet counts (thrombocytosis) may occur with inflammation, iron deficiency, or certain bone marrow conditions. Doctors interpret platelet levels alongside other CBC markers and clinical symptoms.

PDW (Platelet Distribution Width) measures how much variation there is in the size of your platelets. A normal PDW means your platelets are mostly uniform in size. A high PDW means your platelets vary significantly in size — a sign of platelet activation. Most abnormal PDW results are found incidentally on a routine CBC and, on their own, do not usually indicate a serious condition. Talk to your doctor if your PDW is significantly elevated and other CBC values are also abnormal, or if you have symptoms such as unusual bruising or bleeding.

ANTIBODIES ASSOCIATED WITH:
This test by itself is not diagnostic for any condition or disease

Arterial Thrombosis
Autoimmune Thrombocytopenia
Cardiovascular Disease
Coronary Artery Disease
Systemic Lupus Erythematosus (SLE)

BODY TISSUE:

Cardiovascular and Endocrine

A Platelet Neutralization test in a blood test is a specialized laboratory test used to detect the presence of lupus anticoagulants (LAs), which are autoantibodies associated with blood clotting disorders such as antiphospholipid syndrome (APS). It is an essential component of the diagnostic process, but its interpretation requires consideration of other clinical and laboratory information.

P-LCR (Platelet Large Cell Ratio) measures what percentage of your platelets are larger than average. It is part of the platelet indices on a CBC and is reported alongside MPV (mean platelet volume), PDW (platelet distribution width), and platelet count. The normal range is 13–43% in most labs. High P-LCR usually reflects increased platelet turnover — the bone marrow is releasing newer, larger platelets in response to demand. Low P-LCR is less clinically significant and usually indicates more uniform, smaller platelet populations. P-LCR is never interpreted alone — it is always read alongside platelet count, MPV, and PDW.

PCT is the volume occupied by platelets in the blood as a percentage and calculated according to the formula PCT = platelet count × MPV / 10,000 (25-27).

Urinary platinum (Pt) provides an indication of recent or ongoing exposure to the metal, and endogenous detoxification to a lesser extent. Significant exposure to this non-essential, precious metal is unusual except in association with chemotherapy. Pt–containing, high-gold alloys have been used in dentistry for many decades. Platinum is poorly absorbed in the gut and high-level oral exposure is unlikely. Jewelers who make high-end jewelry may be exposed to Pt.

Platinum (Pt) is a nonessential element that is sometimes detected in hair. However, the clinical significance of hair Pt has not been well studied. Hair treatments may contribute to artifactual contamination of scalp hair.

Pt is poorly absorbed in the gut but may be absorbed via inhalation. Since it is a relatively rare element, most Pt exposures are of occupational origin.

SOURCES:

Can be found in soil and river sediments, air, and jewelry. Used as a catalyst in the automotive, chemical, and pharmaceutical industries. It’s resistance to oxidation makes it important in the manufacturing of laboratory equipment. It is also used as a chemotherapeutic agent. 

PHYSIOLOGIC EFFECTS:

Platinum binds to DNA and interferes with transcription and replication resulting in apoptosis.

CLINICAL SIGNIFICANCE:

Metallic forms are inert, but the complex salts can produce conjunctivitis, urticaria, dermatitis, and eczema with dermal exposure. Nephrotoxicity and thrombocytopenia are seen with platinum chemotherapeutic agents. Respiratory exposures can produce wheezing and shortness of breath.

Platinum (Pt) is a nonessential element that is sometimes detected in feces. However, the clinical significance of high levels of Pt in feces has not been well studied. Platinum is poorly absorbed in the gut and high level of oral exposure is unusual. Since it is a relatively rare element, most Pt exposures are of occupational origin. There may have been a slight increase in environmental Pt due to the use of Pt in automobile catalytic converters. Pt is a byproduct of copper refining and used as an alloy in some dental and orthopedic materials.

SOURCES:

Can be found in soil and river sediments, air, and jewelry. Used as a catalyst in the automotive, chemical, and pharmaceutical industries. It’s resistance to oxidation makes it important in the manufacturing of laboratory equipment. It is also used as a chemotherapeutic agent. 

PHYSIOLOGIC EFFECTS:

Platinum binds to DNA and interferes with transcription and replication resulting in apoptosis.

CLINICAL SIGNIFICANCE:

Metallic forms are inert, but the complex salts can produce conjunctivitis, urticaria, dermatitis, and eczema with dermal exposure. Nephrotoxicity and thrombocytopenia are seen with platinum chemotherapeutic agents. Respiratory exposures can produce wheezing and shortness of breath.

Platinum and platinum alloys are used in surgical tools, laboratory utensils, dentistry, jewelry, silicone breast implants, electrical resistance wires, automobile catalytic converters, optical fibers, and liquid crystal display glass, especially for laptops. It is believed that automotive catalytic converters release platinum to the roadside environment. Platinum is used in some chemotherapy drugs, such as cisplatin, which is used to treat ovarian cancer. Workers in the following areas show the highest platinum levels: roadside maintenance, refineries, oncology wards, electronics plants, chemical plants, and jewelry production. Women with silicone breast implants have platinum exposure. One study showed a significant uptake of platinum from platinum-containing dental alloy restorations. The general population is at increasing risk of exposure to platinum because of the widespread use of catalytic converters and growing applications for platinum in various sectors of the economy.