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A New Method of Using Polyethylene Glycol (PEG) Precipitation of Macroprolactin to Detect Genuine Hyperprolactinemia
Yongjian Chen1, Huan Wang1, Wei Yang1
1Department of Clinical Laboratory, Zhejiang Provincial People's Hospital, Hangzhou, China.
Background:
The most commonly used method of polyethylene glycol (PEG) precipitation for macroprolactinemia (MP) screening has some significant drawbacks. The aim of this study was to establish a new method using PEG for precipitation of macroprolactin (macroPRL) to detect genuine hyperprolactinemia (genuine HP).
Methods:
The optimal PEG concentration for precipitation and the effect of PEG on the precipitation of PRL were analyzed to establish and optimize our PEG precipitation method. The PRL recovery rate and genuine HP detection rate were compared between our method and MP screening method.
Results:
About 25% PEG6000 was determined to be the optimal PEG concentration for precipitation. Along with an increase in protein concentration in the PRL calibration solution, the PRL recovery rate after precipitation decreased gradually. The PRL recovery rate increased when the precipitation was carried out with diluted PRL calibration solution; the recovery rate reached greater than 90% after a 5-fold dilution of the calibration solution. The genuine HP detection rate and PRL recovery rate using our diluted serum PEG precipitation method were significantly higher than those obtained with the MP screening method. Our method successfully detected 31 cases of genuine HP, which was significantly higher than the detection rate obtained using the MP screening method (25 cases; P < 0.001).
Conclusion:
Precipitation using 5-fold diluted serum with 25% PEG6000 can effectively reduce the macroPRL concentration, increasing the PRL recovery rate and detection rate of genuine HP after precipitation, which is an effective and convenient method for the detection of genuine HP.
Insights
A new polyethylene glycol (PEG) precipitation method improves macroprolactin (macroPRL) detection. This optimized method enhances the recovery rate and identification of genuine hyperprolactinemia (genuine HP).
Area of Science:
- Clinical Chemistry
- Endocrinology
- Laboratory Medicine
Background:
- Traditional polyethylene glycol (PEG) precipitation for macroprolactinemia (MP) screening presents significant limitations.
- Macroprolactin (macroPRL) can interfere with accurate prolactin (PRL) level assessment.
Purpose of the Study:
- To develop and validate a novel PEG precipitation method for improved macroPRL detection.
- To enhance the accurate diagnosis of genuine hyperprolactinemia (genuine HP).
Main Methods:
- Optimized PEG6000 concentration (25%) and serum dilution (5-fold) for macroPRL precipitation.
- Compared PRL recovery rates and genuine HP detection rates against the standard MP screening method.
Main Results:
- The optimized method achieved a PRL recovery rate greater than 90% with diluted serum.
- Significantly higher genuine HP detection rates were observed (31 cases vs. 25 cases, P < 0.001).
- The new method demonstrated superior PRL recovery and genuine HP detection compared to the existing MP screening method.
Conclusions:
- A 5-fold diluted serum precipitation method using 25% PEG6000 effectively reduces macroPRL levels.
- This optimized approach increases PRL recovery and the detection rate of genuine hyperprolactinemia.
- The developed method offers an effective and convenient solution for diagnosing genuine HP.
