Trio-smart measures a third fermented gas, hydrogen sulfide (H2S). Which is produced by sulfate-reducing bacteria utilizing H2 to produce H2S. Clinical trials have noted that H2S is associated with diarrhea in patients. In a 2021 study, it was found that healthy subjects had H2S levels of <3.00 ppm. Levels of hydrogen sulfide ≥3.00 ppm are associated with diarrhea and indicative of excess hydrogen sulfide. Higher levels of hydrogen sulfide predict more severe diarrhea.

Hemoglobin (Hb) is the iron-containing oxygen transportation protein in red blood cells. It's rate of binding oxygen depends on the number oxygen molecules already bound.

Hafnia alvei plays an active role in fermented foods, such as cheeses, kimchi and other traditional fermented dishes. Increased serum IgA and IgM have been found in chronic fatigue patients with increased intestinal permeability to Hafnia alvei, Pseudomonas aeruginosa, Morganella morganii, Proteus mirabilis, Pseudomonas putida, Citrobacter koseri, and Klebsiella pneumoniae. Hafnia alvei has the potential to decarboxylate histidine to histamine.

Haptoglobin is a protein that your liver produces. It combines with hemoglobin, which transports oxygen to your organs and tissues via the red blood cells.  The haptoglobin test is a test for hemolytic anemia.

Hepatitis B surface antigen (HBsAg) is a distinctive serological marker of acute or chronic hepatitis B infection. HBsAg is the first antigen to appear following infection with HBV and is generally detected 1-10 weeks after the onset of clinical symptoms. HBsAg assays are routinely used to diagnose suspected HBV infection and monitor the status of infected individuals to determine whether the infection has resolved or the patient has become a chronic carrier of the virus.

The HCO3- - Arterial marker on Labcorp's Arterial Blood Gas (ABG) Panel measures the concentration of bicarbonate ions (HCO3-) in the arterial blood. Bicarbonate plays a crucial role in maintaining the acid-base balance of the body, functioning as a buffer to regulate the pH of blood. It helps neutralize excess acids or bases, thus stabilizing the body’s pH levels. HCO3- is closely linked with the respiratory system's ability to excrete CO2 and the kidneys' ability to excrete or retain bicarbonate, making it a key indicator of both metabolic and respiratory health.

HCV Antibody RFX to Quant PCR refers to a diagnostic process used in the detection and quantification of the Hepatitis C Virus (HCV). Initially, the test involves the identification of antibodies produced in response to the HCV infection.

The viral load of hepatitis C refers to the amount of virus present in the bloodstream. The quantitative HCV RNA tests measure the amount of hepatitis C virus in the blood. The result will be an exact number, such as "1,215,422 IU/L." Many people refer to the quantitative measurement as the hepatitis C "viral load."

Monitoring the HDL % of Total Cholesterol is a valuable tool in assessing cardiovascular health. A higher HDL percentage indicates a more favorable cholesterol profile and a reduced risk of heart disease. By maintaining a healthy lifestyle through proper diet, regular exercise, and smoking cessation, you can help improve your HDL percentage and support long-term heart health.

This test identifies 5 subclasses of HDL, 1 is identified as the large HDL subclass. Decreased levels of the large HDL subclass are associated with a 1.8-fold increased risk for CVD. Large HDL particles are functionally associated with an antioxidant, paraoxanase, which may help protect the arterial wall.