SĂĄdan beregnes PSA Density

SĂĄdan beregnes PSA Density

For mænd over 50 år kræver de bedste midler til screening for prostatacancer en kombination af tests: prostata-specifik blodtest og en digital rectum-scan, ifølge Dr. Michael Cookson fra Department of Urological Surgery på Vanderbilt University Medical School. Tallene fra en PSA-test kan returnere en falsk positiv for kræft, som ofte forekommer hos mænd med godartet forstørrede prostata, konstaterer University of Pennsylvania's Abramson Cancer Center. Ved at relatere resultaterne af en PSA-test til størrelsen på en mands prostata kan lægerne afgøre, om det højere niveau af PSA skyldes en godartet forstørrelse eller kræft. For at finde dette tal skal en nøjagtig mængde prostata kirtel laves ved hjælp af en transrectal ultralyd, hvilket kan gøre det muligt at finde PSA-densiteten dyr, ifølge John Hopkins. Dr. Michael Cookson bemærker, at resultaterne af en PSA-tæthed kan vise en falsk positiv eller negativ for kræft, da PSA-testresultaterne varierer dagligt, og TRUSs nøjagtighed for at finde prostata-volumen giver ikke nøjagtige resultater.

Se på PSA-testresultaterne for at afgøre, om patienten har brug for en transrektal ultralyd for at finde den størrelse, der anvendes til beregning af PSA-densitet. Vælg en TRUS, hvis PSA testen returnerer resultater på 2,5 ng / ml eller højere. University of Pennsylvania bemærker, at nogle forskere anbefaler en biopsi eller yderligere test, mens andre fortsætter test i niveauer fra 4,0 ng / ml til 10 ng / ml til PSA testen.

Udfør en transrectal ultralyd for at finde prostata volumen ved at måle længden, bredden og højden af ​​prostata. Multiplicér disse tal sammen og multiplicer resultatet med 0,52 for at finde prostata-volumenet.

Opdel PSA-testnummeret med størrelsen af ​​prostata-kirtlen, der blev fundet under den transrektale ultralyd for at finde PSA-densiteten. For eksempel, hvis en patient har en PSA-test på 6,0 ng / ml og et prostata-volumen på 40 ml, dividerer 6,0 ved 40.

6.0/40 = 0.15.

Evaluer resultaterne af PSA-tætheden for tal på 0,15 eller højere, hvilket reducerer sandsynligheden for, at den forhøjede PSA-test kom fra en godartet vækst ifølge Cookson. Overvej enten en "watch and wait" tilgang eller biopsi til yderligere evaluering af patientens helbred.
SĂĄdan beregnes PSA Density

FAQ - 💬

❓ What is a good PSA density score?

👉 The study identified an optimal PSA density threshold of 0.08, with a negative predictive value of 96% for clinically significant disease. These data suggest that men with PSA density of 0.08 or less harbor a very low risk of clinically significant prostate cancer.

❓ Does high PSA density mean cancer?

👉 Does Your PSA Density Actually Matter? On one hand, a high PSA density could indicate you have a higher risk of prostate cancer. 4 However, the evidence for this likely higher risk of prostate cancer does not really change your diagnosis or treatment if you have a high PSA density.

❓ Is PSA density important?

👉 PSA density is an accurate predictor for adverse pathology prediction in patients undergoing radical prostatectomy.

❓ What is the average PSA for a 70 year old?

👉 For men aged 70 to 79, they suggested a normal serum PSA reference range of 0.0–6.5 ng/mL (0.0–6.5 ÎĽg/L). In our population, 38% of patients with clinically significant and 37% with high-grade prostate cancer had a serum PSA level lower than 6.5 ÎĽg/L and would have been missed using age-specific guidelines.

❓ What is the meaning of PSA density?

👉 The PSA density (PSAD), is a calculation performed at diagnosis and is the serum prostate specific antigen (PSA) level (ng/mL) divided by the volume of the prostate gland (mL), resulting in a value with the units, ng/mL2 1.

❓ At what PSA level should a biopsy be done?

👉 A prostate-specific antigen (PSA) level above 4 ng/mL has historically been recognized as an appropriate threshold to recommend biopsy; however the risk of high-grade disease observed among men with lower PSA levels in the Prostate Cancer Prevention Trial has led to calls to change the criteria for biopsy referral.

❓ What is the most accurate test for prostate cancer?

👉 If your doctor determines you should undergo screening, he or she will most likely recommend the PSA test. For more than 30 years, the PSA test has been the gold standard in prostate cancer screening. This simple blood test measures how much prostate-specific antigen is in your blood.

❓ What is normal PSA by age?

👉 0-2.5: Normal for a man 40-50 yrs. 2.5-3.5: Normal for a man 50-60 yrs. 3.5-4.5: Normal for a man 60-70 yrs. 4.5-5.5: Normal for a man 70-80 yrs.

❓ What causes PSA to rise?

👉 For example, the PSA level tends to increase with age, prostate gland size, and inflammation or infection. A recent prostate biopsy will also increase the PSA level, as can ejaculation or vigorous exercise (such as cycling) in the 2 days before testing.

❓ What is high PSA level?

👉 PSA levels under 4 ng/ml are generally considered normal, while levels over 4 ng/ml are considered abnormal. PSA levels between 4 and 10 ng/ml indicate a risk of prostate cancer higher than normal. When the PSA level is above 10 ng/ml, risk of prostate cancer is much higher.

❓ What PSA indicates metastasis?

👉 A serum PSA value of <10 ng/ml nearly excludes bone metastases, whereas a serum PSA value of> 100 ng/ml is highly predictive of bone metastases.

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