Editing Bleeding time (section)

==Process==
The test involves cutting the underside of the subject's forearm, in an area where there is no hair or visible [[vein]]s. The cut is of a standardized width and depth, and is done quickly by a template device.<ref name="v636">{{cite journal | last1=Quiroga | first1=T. | last2=Goycoolea | first2=M. | last3=Muñoz | first3=B. | last4=Morales | first4=M. | last5=Aranda | first5=E. | last6=Panes | first6=O. | last7=Pereira | first7=J. | last8=Mezzano | first8=D. | title=Template bleeding time and PFA-100® have low sensitivity to screen patients with hereditary mucocutaneous hemorrhages: comparative study in 148 patients | journal=Journal of Thrombosis and Haemostasis | volume=2 | issue=6 | date=2004 | doi=10.1111/j.1538-7836.2004.00693.x | pages=892–898| pmid=15140124 }}</ref>

===IVY method===

The IVY method is the traditional format for this test. While both the IVY and Duke's method require the use of a [[sphygmomanometer]], or blood pressure cuff, the IVY method is more invasive than the Duke method, utilizing an [[Incision and drainage|incision]] on the ventral side of the forearm, whereas the Duke method involves puncture with a [[Blood lancet|lancet]] or special needle.  In the IVY method, the blood pressure cuff is placed on the upper arm and inflated to 40 mmHg. A lancet or scalpel blade is used to make a shallow incision that is 1 millimeter deep on the underside of the forearm.<ref name="o137">{{cite journal | last1=Burns | first1=E. R. | last2=Lawrence | first2=C. | title=Bleeding time. A guide to its diagnostic and clinical utility | journal=Archives of Pathology & Laboratory Medicine | volume=113 | issue=11 | date=1989 | issn=0003-9985 | pmid=2535679 | pages=1219–1224}}</ref>

A standard-sized incision is made around 10&nbsp;mm long and 1&nbsp;mm deep. The time from when the incision is made until all bleeding has stopped is measured and is called the bleeding time. Every 30 seconds, filter paper or a paper towel is used to draw off the blood.

The test is finished when bleeding has stopped.<ref name="urlBlood Chemistries">{{cite web|url=http://www.obgyn.ufl.edu/obgyn101/Lab/Blood%20Chemistries.htm |title=Blood Chemistries |access-date=2009-01-02 |url-status=dead |archive-url=https://web.archive.org/web/20070814013421/http://www.obgyn.ufl.edu/obgyn101/Lab/Blood%20Chemistries.htm#Liver%20Function%20Tests |archive-date=August 14, 2007 }}</ref>

A prolonged bleeding time may be a result from decreased number of thrombocytes or impaired blood vessels. However, the depth of the puncture or incision may be the source of error.

[[Reference ranges for common blood tests|Normal values]] fall between 3&nbsp;– 10 minutes depending on the method used.

A disadvantage of Ivy's method is closure of puncture wound before stoppage of bleeding.<ref name=":0">{{Cite journal|url=https://www.bioscience.com.pk/topics/microbiology/item/151-bleeding-time-and-clotting-time|title=BLEEDING TIME (BT) AND CLOTTING TIME (CT)|last=Dg|first=Dayyal|year=2016|journal=BioScience|issn=2521-5760}}</ref>

===Duke's method===

With the Duke's method, the patient is pricked with a special needle or lancet, preferably on the [[earlobe]]<ref name="isbn0-7817-3066-X">{{cite book |author1=Schafer, Andrew I. |author2=Loscalzo, Joseph |title=Thrombosis and hemorrhage |publisher=Lippincott Williams & Wilkins |location=Hagerstwon, MD |year=2003 |pages=397  |isbn=978-0-7817-3066-2 }}</ref> or [[fingertip]], after having been swabbed with alcohol. The prick is about 3–4&nbsp;mm deep. The patient then wipes the blood every 30 seconds with a filter paper. The test ceases when bleeding ceases. The usual time is about 2–5 minutes.

This method is not recommended and cannot be standardized because it can cause a large local hematoma.<ref name=":0" />